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Berlin's Brandenburg Gate, Paris' Eiffel Tower, Rome's Vatican and Barcelona's Sagrada Família have joined the WWF's Earth Hour in switching off their lights for an hour to raise awareness of climate change and energy use.

The Baldaling section of the Great Wall of China before Earth Hour Credit: REUTERS/Jason Lee

The Great Wall of China took part in this year's Earth Hour. Everyone around the world is asked to turn off lights for an hour from 8.30pm local time as a show of support for tougher action to confront climate change.

The Balding section of the Great Wall of China after Earth Hour Credit: REUTERS/Jason Lee